Punch press



R. M. MACGREGOR.

' PUNCH PRESS. APPLlcAnoN man APR, so, 1921.'

' .Patented May 30, 1922.

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runen rnnssi To all whom t may concern: c

Be it known that I, ROBERT M. MACGREGOR, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in Punch Presses, of which the following is a specification.

This invention relates to a'machinecommonly termed a deep throat punch press. Suchy machines' are morel particularly designed for blacksmith shops, structural iron works kandother meta-l working plants which are frequently required to punch, cre-ase or shear metal sheets. Y

The object of the invention is to provide a machine of this nature which is light and portable so that it may be moved up to the work when desired and yet Awhich is strong and powerful and can be operatedby anyone to punch, crease or shear relatively thick plates of considerable width and indefinite length. Y In the accompanying drawings Figure 1 shows a side view of a press which embodies the invention. Fig. 2 is a vertical transverse section of the press on the plane indicated. by the dotted line 2-2 on Fig, 1. Fig. 3 is a longitudinal vertical section on the plane indicated by thedotted line 3-3 on Fig. 2 showing the punch operating eccentric.

The frame of the machine illustrated comprises two channel bars 1 arranged parallel with each other a slight distance apart and two channel bars 2 arranged parallel with each other a slight distance apart. At their ends the bars are rigidly bolted or otherwise fastened to posts 3 and are supported by legs 4. For the purpose of giving ad ditional strength to the' frame and prevent-V ing the bars from yielding under the Astrains of use, downwardly extending brackets 5 are fastened to the under side at the ymiddle of the lower pair of bars and truss rods 6 are c passed over these brackets and bolted at their ends to the inside of the lower bars. Upwardly extending'brackets7 are fastened to the top at the middle of the upper pair vof bars and truss rods 8 are passed over these brackets and fastened at their ends to the inside of the upper bars. This construction forms a comparatively light yet very rigid frame.

Firmly secured by bolts between the lower bars at the middle is a filling block 9 with a central opening and on the top of this is a die plate 10 having an opening or cavity of Specification of'etters Patent. Paigeutyed ltlay 30 1922, .application nietiiiprii 3o, i921. semaine. '4e5,e3e. Y

the required shape. y.Bolted between the uplper bars at the middle is a lling block 11 with a central opening. Fitted so that it will move up and down and'be guided by the wall of the vertical opening in the block 1l is a ram 12 inthe lower en d of which a ,Y

, punch or cutter of the required shape isy fastened. Supported belowthe block 11 and pressed downward by springs 14 isa stripping platelof common for liounted in bearings in the upper brackets 'l 7 is a shaft 16 on which between the brackets is A an eccentric 17.l The eccentricy strap *'18 about this eccentric is connected by a link 19- with the upper yend'of the ram 12. Fastened v l on one end ofthe eccentric shaftis an oper'- vating wheel 2O that is provided with handle i spokes 21 by means of which the wheel and shaft may be rotated, and spokes 22 vbearing weights 23 that are employed t'o insure a powerful rotatory momentum when thev wheel is turned for driving .the tool through the metal to be operatedupon. This machine vis cheap to build. As `constructed it is light in weight and can be' c0nveniently moved to the' work if desiredn'y lWith it sheets of rela-tively thick steel or other metal of considerable width and ofk any' i length may be accurately punched, creased,

`drawn or sheared, according to the conditions and the tools supplied, for the frame is open from end to endfand yet is very rigid and great force is exerted through the eccentric v driven lram as actuated by the weighted hand wheel. c

The invention claimed is:

1. A punch presshaving a frame comprising a pair of `parallel' bars arranged horizontally and supported at their ends upon legs, a die bed mounted on said bars intermediate 4the legs, a pair ofparallel bars horizontally arranged and supported at their ends yabove the first mentioned bars,y

a ram guide mounted onsaid upper bars inloo termediate the end supports, atoolcarrying ram movable up and down 'throughk ,said

ram guide, rotary means mounted lonJsaidy upper bars for reciprocating the ram, and a weighted hand wheel for rotating said' ram reciprocating means. i l c 2. A punch press having a frame comprising a pair of parallel bars supported upon legs, a pair of parallel bars supported at their ends above the first mentioned bars, brackets projecting down from the middle of the lower pair of barsand projecting upf Q i f 1 -Ward from the middle of the upper pair olik bars7 truss rods passing over said brackets and having their .ends connected with the bars., a die bed 'fastened between the lower bars at the middle, a ram guide fastened betiveenthe upper bars at the`middle a tool carrying ram movable vertically through said ram guide, rotatory means :tor reciproeating; the ram, and a Weighted hand Wheel for rotating` said ram reciprocating means.

3. l punch press having' a trame comprising` a pair of parallel hars arranged horizontally and supported at 'their ends upon legsu a die bed mounted on said hars intermediate the legs7 a pair of parallel bars horizontally arranged and supported at their ends above the first mentioned bars,v a ram lguide mounted on said upper kbars intermediate the end supports, a tool carryingram vertically movable through said ram guide, a shaft mounted on said upper bars above the ram guide, an eccentric on said shaft, a connection between the eccentric andthe ram, and a Weighted hand Wheel for rotating the shaft.

4. A punch press having a frame compris ing a pair of channel bars arranged horizontallyv and parallel With each other, a pair ol: channel bars arranged horizontally and parallel With-each' other above the lirst mentioned bars,r posts connecting the ends of the har oit each pair and the pairs with each other a die bed mounted on the lower pair of bars,` a ram guide mounted on the upper pair of bars` a ram movable in the guide1 and rotatory means mounted on said upper pair ot bars for reciprocating the ram.

A; punch press having a frame formed of apair of horizontally arranged parallel bars and a pair oi2 parallel bars horizontally arranged above the first mentioned bars,

said barsfbeing; connected at their ends onlv7 and a fixed die, reciprocatory ram and means for reciprocatinp' the ram mounted Vonjsaid frame intermediate the'ends thereof, Whereby there is adeep throat on each side of the ram and die vand the strains resulting from the action of the tools on the Work are sustained on both sides of theram anddie ROBERT M. MAQ GREGOR. 

